Consistent explanation for the cosmic-ray positron excess in p-wave Breit-Wigner enhanced dark matter annihilation

doi:10.1140/epjc/s10052-022-10048-y

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	Consistent explanation for the cosmic-ray positron excess in p-wave Breit-Wigner enhanced dark matter annihilation
	Ding, Yu-Chen ; Ku, Yu-Lin ; Wei, Chun-Cheng ; Zhou, Yu-Feng
刊名	EUROPEAN PHYSICAL JOURNAL C
	2022
卷号	82 期号:2 页码:126
关键词	DWARF GALAXIES PROPAGATION ANTIPROTONS COSMOLOGY EFFICIENT MODEL
ISSN号	1434-6044
DOI	10.1140/epjc/s10052-022-10048-y
英文摘要	Dark matter (DM) annihilation in the galactic halo can be enhanced relative to that in the early Universe due to the Breit-Wigner enhancement, if the DM particles annihilate through a narrow resonance. Although the s-wave Breit-Wigner enhancement can provide a consistent explanation for both the observed cosmic-ray (CR) positron excess and the DM thermal relic density, it is severely constrained by the observations of gamma rays from dwarf spheroidal satellite galaxies (dSphs) and the cosmic microwave background (CMB), which have relatively lower allowed DM annihilation cross section and typical DM velocities than that in the galactic halo. Furthermore, in the s-wave Breit-Wigner enhancement, the case where the resonance mass is below a threshold (twice the DM mass) is ruled out due to the monotonically increasing annihilation cross section with decreasing DM velocity. In this work, we consider Breit-Wigner enhanced p-wave DM annihilation. We explore the parameter regions which can simultaneously account for the CR positron excess and DM thermal relic density without violating the constraints from dSphs gamma rays and CMB. We show that the velocity-dependent cross section in this scenario can peak around the typical DM velocity in the galactic halo for the resonance mass both above and below the threshold. Moreover, the highly suppressed annihilation cross section at extremely low DM velocity can evade the constraints from dSphs gamma rays and CMB easily, which results in larger allowed parameter regions than that in the s-wave case.
学科主题	Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/27706]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China 2.Int Ctr Theoret Phys Asia Pacific, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China 4.Hangzhou Inst Adv Study, Sch Fundamental Phys & Math Sci, UCAS, Hangzhou 310024, Peoples R China 5.[Ding, Yu-Chen 6.Ku, Yu-Lin 7.Wei, Chun-Cheng
推荐引用方式 GB/T 7714	Ding, Yu-Chen,Ku, Yu-Lin,Wei, Chun-Cheng,et al. Consistent explanation for the cosmic-ray positron excess in p-wave Breit-Wigner enhanced dark matter annihilation[J]. EUROPEAN PHYSICAL JOURNAL C,2022,82(2):126.
APA	Ding, Yu-Chen,Ku, Yu-Lin,Wei, Chun-Cheng,&Zhou, Yu-Feng.(2022).Consistent explanation for the cosmic-ray positron excess in p-wave Breit-Wigner enhanced dark matter annihilation.EUROPEAN PHYSICAL JOURNAL C,82(2),126.
MLA	Ding, Yu-Chen,et al."Consistent explanation for the cosmic-ray positron excess in p-wave Breit-Wigner enhanced dark matter annihilation".EUROPEAN PHYSICAL JOURNAL C 82.2(2022):126.